CN113346579A - Method for monitoring operation error of metering equipment in DC charging station - Google Patents

Method for monitoring operation error of metering equipment in DC charging station Download PDF

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CN113346579A
CN113346579A CN202110577450.7A CN202110577450A CN113346579A CN 113346579 A CN113346579 A CN 113346579A CN 202110577450 A CN202110577450 A CN 202110577450A CN 113346579 A CN113346579 A CN 113346579A
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charging
charging gun
operation error
gun
charging station
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CN113346579B (en
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刘炜
陆春光
陈婧韵
金正军
宋磊
李亦龙
肖涛
吕建
李波
马笛
孙微庭
严朝豪
巩国栋
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Hangzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
State Grid Zhejiang Electric Vehicle Service Co Ltd
Marketing Service Center of State Grid Zhejiang Electric Power Co Ltd
Beijing Zhixiang Technology Co Ltd
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Hangzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
State Grid Zhejiang Electric Vehicle Service Co Ltd
Marketing Service Center of State Grid Zhejiang Electric Power Co Ltd
Beijing Zhixiang Technology Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

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  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention belongs to the technical field of charging stations, and particularly relates to a method for monitoring running errors of metering equipment in a direct-current charging station. Aiming at the defect that the operation error of the charging station is detected by adopting a field verification system at present, the invention adopts the following technical scheme: a method for monitoring running errors of metering equipment in a direct current charging station comprises the following steps: establishing an equation about the power supply quantity of an alternating current side, the power consumption of each charging gun, the inherent loss of a charging station, the energy conversion efficiency of each charging pile AC-DC conversion module, equivalent error parameters and the heat loss of each charging gun; acquiring electric quantity data of each charging gun metering point on an alternating current side and a direct current side of a charging station in a plurality of metering cycles and energy conversion efficiency of each charging pile; and substituting the electric quantity data and the energy conversion efficiency into an equation to establish an equation set, and solving the equation set to obtain the heat loss of each charging gun and the equivalent error parameter of each charging gun. The invention has the beneficial effects that: the on-site detection is not needed, the timeliness is high, and the on-line real-time analysis can be realized.

Description

Method for monitoring operation error of metering equipment in DC charging station
Technical Field
The invention belongs to the technical field of charging stations, and particularly relates to a method for monitoring running errors of metering equipment in a direct-current charging station.
Background
The direct current charging station is a facility which is provided with a plurality of charging piles and provides a direct current charging power supply for the electric automobile. A charging station comprises basic components such as a charging system, a power distribution system, a monitoring system and the like, wherein the charging system provides power for the operation of the charging station, and the charging system is the basis for the normal operation of the whole charging station. A charging station typically has a plurality of charging posts, one with one or more charging guns.
During installation and operation of the charging station, the measurement accuracy in the station needs to be detected. At present, a monitoring method for operation errors of metering equipment in a charging station is mainly field verification. The monitoring of the direct current charging station needs to utilize special equipment based on real load detection, and is mostly an integrated field monitoring vehicle, the cost is high, and the detection of a single metering point consumes a long time. With the continuous increase of the quantity of the charging piles, the research on the new, on-line and high-cost-performance state monitoring technology of the charging station metering equipment has great significance on the operation and maintenance management of the charging station.
Disclosure of Invention
The invention provides a method for monitoring the running errors of metering equipment in a direct-current charging station, which aims at the defect that a field verification system is adopted to detect the running errors of the charging station at present, and is used for running and maintaining the charging station and providing reference for field verification of the charging station.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for monitoring the operation error of metering equipment in a direct current charging station comprises the following steps:
establishing an equation about the power supply quantity of an alternating current side, the power consumption of each charging gun, the inherent loss of a charging station, the energy conversion efficiency of each charging pile AC-DC conversion module, an equivalent operation error parameter and the heat loss of each charging gun according to an energy conservation law;
acquiring electric quantity data of each charging gun metering point on an alternating current side and a direct current side of the charging station in P high-efficiency working metering cycles and energy conversion efficiency of each charging pile, wherein P is more than 10 times of the number M of the charging guns;
step three, substituting the electric quantity data and the energy conversion efficiency into an equation to establish an equation set, and solving the equation set to obtain inherent electric quantity loss of the charging station, heat loss of each charging gun and equivalent operation error parameters of each charging gun;
step four, converting the equivalent operation error parameters of the charging gun into the operation error of the charging gun;
and step five, comparing the running error of the charging gun with a threshold value, and judging whether the charging gun is normally metered.
The method for monitoring the operation error of the metering equipment in the DC charging station has the advantages that: by establishing equations about the power supply electric quantity at the AC side, the power consumption of each charging gun, the inherent loss of the charging station, the energy conversion efficiency of each charging pile AC-DC conversion module and the equivalent operation error parameters, after electric quantity data of each charging gun metering point at the AC side and the DC side of the charging pile in a plurality of high-efficiency work metering cycles and the energy conversion efficiency of the charging pile are obtained, the equivalent operation error parameters can be obtained through calculation, the operation error of the charging gun is further obtained, the timeliness is high, and online real-time analysis can be realized. The charging gun operation error comprises an AC-DC conversion module error and a charging gun metering error, and under a normal condition, the AC-DC conversion module error and the charging gun operation error are both in a normal range. Also, the efficiency of the AC-DC conversion module may decay over its life, but the decay is extremely limited. In the case where the AC-DC conversion module is not damaged, the reduction in efficiency thereof is negligible. In actual operation, when a large abnormality occurs, the AC-DC conversion module is often damaged, and the unnatural attenuation is too large. The AC-DC conversion module error and the charging gun metering error are judged as a whole, so that the feasibility is higher, and the practicability is stronger.
As an improvement, the equation is:
Figure BDA0003084945070000021
in the formula, Ki is the equivalent operation error parameter phi of each charging gunDC，iFor each charging gun, ηiEnergy conversion efficiency of charging pile AC-DC conversion module corresponding to each charging guniIs the loss factor, epsilon0For inherent losses of charging station, phiACAnd supplying power to the AC side of the charging station, wherein i is the serial number of the charging guns, and M is the number of the charging guns.
As an improvement, the system of equations is:
Figure BDA0003084945070000022
wherein P is a metering period, P is more than 10 times of the number M of the charging guns,
wherein, have again:
Figure BDA0003084945070000023
dy is the deviation of the charge station electric quantity measurement,
because dy can be supplied with power phi by the alternating current side of the charging pileACPower consumption phi of each charging gunDC，iEnergy conversion efficiency eta of charging pile AC-DC conversion module corresponding to each charging guniThe unknown number is obtained as the only inherent loss epsilon of the charging station0Loss coefficient beta of each charging guniAnd equivalent operating error parameter kappa of each charging guniThe AC side power supply electric quantity phi of the charging pileACPower consumption phi of each charging gunDC，iEnergy conversion efficiency eta of charging pile AC-DC conversion module corresponding to each charging guniAnd substituting the parameters into an equation set to solve and obtain equivalent operation error parameters Ki of each charging gun.
As an improvement, the operating error epsilon of each charging guniIs obtained by the following formula:
Figure BDA0003084945070000031
as an improvement, the AC side power supply quantity phi of the charging stationACObtained by reading an ac meter provided on the ac side.
As an improvement, the power consumption phi of each charging gunDC，iObtained by reading the charging gun meter.
As an improvement, the inherent loss epsilon of the charging station0Charging, display and communication modules of the charging pile are included.
As an improvement, since the average energy conversion efficiency η is high and stable when the DC charging pile AC-DC conversion module operates at high efficiency (the output power is greater than 20% of the rated power), the metering period of each pile operating at high efficiency in the screening station is used for model calculation. Namely, the high-efficiency metering period refers to that the average charging power of each pile in the station in the metering period is greater than 20% of the rated power, and the conversion efficiency of the AC-DC conversion module is at a stable value close to a field-outgoing detection value at the moment.
As an improvement, the fluctuation of the conversion efficiency of different charging processes in the actual work of the charging pile near the detection value is equivalent to adding certain noise on the conversion efficiency column of the equation set, and when the number P of the metering cycles for solving the equation is more than 10 times of the number of the charging guns in the station, the fluctuation does not influence the effectiveness of the final operation error according to a law of large numbers.
In the second step, the acquired data is remotely transmitted to a server to realize remote online monitoring.
As a refinement, the equation is obtained as follows:
according to the law of conservation of energy, there are:
charging station AC side power supply quantity is equal to DC side charging quantity + inherent loss + AC-DC conversion module loss quantity of each charging pile + heat loss power consumption of each charging gun (1)
Wherein the AC-DC conversion module efficiency eta satisfies:
Figure BDA0003084945070000032
the formula (1) and the formula (2) are combined to obtain
The AC side power supply quantity of the AC station is equal to the DC side charging quantity/etai+ energy consumption of each charging gun + inherent loss (3)
Simultaneously, the method comprises the following steps:
Figure BDA0003084945070000033
wherein phi isDC，iFor each charging gun, XDC，iThe real electricity consumption of each charging gun at the direct current side,
the following steps are provided:
Figure BDA0003084945070000041
derived from formula (4) and formula (5):
Figure BDA0003084945070000042
according to formula (3) and formula (6), we obtain:
Figure BDA0003084945070000043
wherein the content of the first and second substances,
Figure BDA0003084945070000044
for equivalent resistivity, making variable substitutions
Figure BDA0003084945070000045
Is provided with
Figure BDA0003084945070000046
Wherein beta isiThe loss coefficient is the parameter to be solved, the voltage on the power transmission line in the corresponding station is basically unchanged in the charging process of the charging gun, the current is stable in the whole charging process,the power loss is mainly the heat loss, so the partial loss is proportional to the square of the charging power,
and dy is:
Figure BDA0003084945070000047
substituting formula (5) and formula (8) for formula (9), there are:
Figure BDA0003084945070000048
combined vertical type (9) and formula (10) to obtain
Figure BDA0003084945070000049
The method for monitoring the operation error of the metering equipment in the DC charging station has the advantages that: by establishing equations about the power supply quantity at the AC side, the power consumption of each charging gun, the inherent loss of the charging station, the energy conversion efficiency of each charging pile AC-DC conversion module, equivalent operation error parameters and the heat loss of each charging gun, after obtaining the electric quantity data of each charging gun metering point at the AC side and the DC side of the charging pile in a plurality of high-efficiency work metering cycles and the energy conversion efficiency of the charging pile, calculating to obtain equivalent operation error parameters so as to obtain the operation error of the charging gun, wherein the timeliness is high, and online real-time analysis can be realized; the heat loss of each charging gun is calculated, and the accuracy is high.
Drawings
Fig. 1 is a circuit topology structure of a direct charging pile applicable to the method for monitoring the operation error of the metering device in the direct current charging station.
Fig. 2 is a flowchart of a first embodiment of a method for monitoring an operation error of a metering device in a dc charging station according to the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be explained and explained below with reference to the drawings of the embodiments of the present invention, but the embodiments described below are only preferred embodiments of the present invention, and are not all embodiments. Other embodiments obtained by persons skilled in the art without any inventive work based on the embodiments in the embodiment belong to the protection scope of the invention.
Referring to fig. 1 and fig. 2, the method for monitoring the operation error of the metering device in the dc charging station of the present invention includes the following steps:
establishing an equation about the power supply quantity of an alternating current side, the power consumption of each charging gun, the inherent loss of a charging station, the energy conversion efficiency of each charging pile AC-DC conversion module, an equivalent operation error parameter and the heat loss of each charging gun according to an energy conservation law;
acquiring electric quantity data of each charging gun metering point on an alternating current side and a direct current side of the charging station in P high-efficiency working metering cycles and energy conversion efficiency of each charging pile, wherein P is more than 10 times of the number M of the charging guns;
step three, substituting the electric quantity data and the energy conversion efficiency into an equation to establish an equation set, and solving the equation set to obtain inherent electric quantity loss of the charging station, heat loss of each charging gun and equivalent operation error parameters of each charging gun;
step four, converting the equivalent operation error parameters of the charging gun into the operation error of the charging gun;
and step five, comparing the running error of the charging gun with a threshold value, and judging whether the charging gun is normally metered.
The method for monitoring the operation error of the metering equipment in the DC charging station has the advantages that: by establishing equations about the power supply quantity at the AC side, the power consumption of each charging gun, the inherent loss of the charging station, the energy conversion efficiency of each charging pile AC-DC conversion module, equivalent operation error parameters and the heat loss of each charging gun, after obtaining the electric quantity data of each charging gun metering point at the AC side and the DC side of the charging pile in a plurality of high-efficiency work metering cycles and the energy conversion efficiency of the charging pile, calculating to obtain equivalent operation error parameters so as to obtain the operation error of the charging gun, wherein the timeliness is high, and online real-time analysis can be realized; the heat loss of each charging gun is calculated, and the accuracy is high. The charging gun operation error comprises an AC-DC conversion module error and a charging gun metering error, and under a normal condition, the AC-DC conversion module error and the charging gun operation error are both in a normal range. Also, the efficiency of the AC-DC conversion module may decay over its life, but the decay is extremely limited. In the case where the AC-DC conversion module is not damaged, the reduction in efficiency thereof is negligible. And when a large abnormality occurs, the AC-DC conversion module is damaged rather than the unnatural attenuation is too large. The AC-DC conversion module error and the charging gun metering error are judged as a whole, so that the feasibility is higher, and the practicability is stronger.
Example one
Referring to fig. 1 and fig. 2, a method for monitoring an operation error of a metering device in a dc charging station according to an embodiment of the present invention includes the following steps:
establishing an equation about the power supply quantity of an alternating current side, the power consumption of each charging gun, the inherent loss of a charging station, the energy conversion efficiency of each charging pile AC-DC conversion module, an equivalent operation error parameter and the heat loss of each charging gun according to an energy conservation law;
acquiring electric quantity data of each charging gun metering point on an alternating current side and a direct current side of the charging station in P high-efficiency working metering cycles and energy conversion efficiency of each charging pile, wherein P is more than 10 times of the number M of the charging guns;
step three, substituting the electric quantity data and the energy conversion efficiency into an equation to establish an equation set, and solving the equation set to obtain inherent electric quantity loss of the charging station, heat loss of each charging gun and equivalent operation error parameters of each charging gun;
step four, converting the equivalent operation error parameters of the charging gun into the operation error of the charging gun;
and step five, comparing the running error of the charging gun with a threshold value, and judging whether the charging gun is normally metered.
In this embodiment, the equation is:
Figure BDA0003084945070000061
in the formula, Ki is the equivalent operation error parameter phi of each charging gunDC，iFor each charging gun, ηiEnergy conversion efficiency of charging pile AC-DC conversion module corresponding to each charging guniIs the loss factor, epsilon0For inherent losses of charging station, phiACAnd supplying power to the AC side of the charging station, wherein i is the serial number of the charging guns, and M is the number of the charging guns.
In this embodiment, the system of equations is:
Figure BDA0003084945070000062
wherein, have again:
Figure BDA0003084945070000063
dy is the deviation of the charge station electric quantity measurement,
because dy can be supplied with power phi by the alternating current side of the charging pileACPower consumption phi of each charging gunDC，iEnergy conversion efficiency eta of charging pile AC-DC conversion module corresponding to each charging guniThe unknown number is obtained as the only inherent loss epsilon of the charging station0Loss coefficient beta of each charging guniAnd equivalent operating error parameter kappa of each charging guniThe AC side power supply electric quantity phi of the charging pileACPower consumption phi of each charging gunDC，iEnergy conversion efficiency eta of charging pile AC-DC conversion module corresponding to each charging guniAnd substituting the parameters into an equation set to solve and obtain equivalent operation error parameters Ki of each charging gun.
In this embodiment, the operating error ε of each charging guniIs obtained by the following formula:
Figure BDA0003084945070000071
in this embodiment, charging stationCurrent side power supply quantity phiACObtained by reading an ac meter provided on the ac side.
In this embodiment, the power consumption φ of each charging gunDC，iObtained by reading the charging gun meter.
In this embodiment, the inherent loss ε of the charging station0Charging, display and communication modules of the charging pile are included.
In this embodiment, each charging pile AC-DC conversion module has energy conversion efficiency ηiObtained through factory certification data.
In the second step, the obtained data is remotely transmitted to the server, so that remote online monitoring is realized.
In this embodiment, the equation is obtained as follows:
according to the law of conservation of energy, there are:
charging station AC side power supply quantity is equal to DC side charging quantity + inherent loss + AC-DC conversion module loss quantity of each charging pile + heat loss power consumption of each charging gun (1)
Wherein the AC-DC conversion module efficiency eta satisfies:
Figure BDA0003084945070000072
the formula (1) and the formula (2) are combined to obtain
The AC side power supply quantity of the AC station is equal to the DC side charging quantity/etai+ energy consumption of each charging gun + inherent loss (3)
Simultaneously, the method comprises the following steps:
Figure BDA0003084945070000073
wherein phi isDC，iFor each charging gun, XDC，iThe real electricity consumption of each charging gun at the direct current side,
the following steps are provided:
Figure BDA0003084945070000074
derived from formula (4) and formula (5):
Figure BDA0003084945070000075
according to formula (3) and formula (6), we obtain:
Figure BDA0003084945070000081
wherein the content of the first and second substances,
Figure BDA0003084945070000082
for equivalent resistivity, making variable substitutions
Figure BDA0003084945070000083
Is provided with
Figure BDA0003084945070000084
Wherein, betaiThe loss coefficient is the parameter to be solved, because the voltage on the power transmission line in the corresponding station in the charging process of the charging gun is basically unchanged, the current in the whole charging process is stable, and the electric quantity loss is mainly the heat loss, the partial loss is in direct proportion to the square of the charging electric quantity,
the charging station electric quantity measurement deviation dy is:
Figure BDA0003084945070000085
substituting formula (5) and formula (8) for formula (9), there are:
Figure BDA0003084945070000086
combined vertical type (9) and formula (10) to obtain
Figure BDA0003084945070000087
The method for monitoring the operation error of the metering equipment in the DC charging station has the beneficial effects that: by establishing an equation about the power supply electric quantity at the AC side, the power consumption of each charging gun, the inherent loss, the energy conversion efficiency of the AC-DC conversion module of the charging pile and the equivalent operation error parameter, after the electric quantity data and the energy conversion efficiency of the charging pile of the metering points of each charging gun at the AC side and the DC side in a plurality of high-efficiency work metering cycles are obtained, the equivalent operation error parameter can be obtained through calculation, and further the operation error of the charging gun is obtained; the operation error is not directly solved, the equivalent operation error parameter is solved firstly and then converted into the operation error, other approximate conditions are not introduced in the calculation process, and the accuracy of the calculation result is ensured; the heating loss of each charging gun circuit is considered, and the accuracy rate is high; the timeliness is high, and online real-time analysis can be realized; the core of the method is the establishment and solution of an equation set, the calculated amount is small, the method can be realized and deployed on the existing vehicle networking or power grid data platform, the realization cost is low, and the online monitoring can be realized.
While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention is not limited thereto but is intended to cover all modifications and equivalents as may be included within the spirit and scope of the invention. Any modification which does not depart from the functional and structural principles of the invention is intended to be included within the scope of the following claims.

Claims (10)

1. A method for monitoring operation errors of metering equipment in a direct current charging station is characterized by comprising the following steps: the method for monitoring the operation error of the metering equipment in the direct current charging station comprises the following steps:
establishing an equation about the power supply quantity of an alternating current side, the power consumption of each charging gun, the inherent loss of a charging station, the energy conversion efficiency of each charging pile AC-DC conversion module, an equivalent operation error parameter and the heat loss of each charging gun according to an energy conservation law;
acquiring electric quantity data of each charging gun metering point on an alternating current side and a direct current side of the charging station in P high-efficiency working metering cycles and energy conversion efficiency of each charging pile, wherein P is more than 10 times of the number M of the charging guns;
step three, substituting the electric quantity data and the energy conversion efficiency into an equation to establish an equation set, and solving the equation set to obtain inherent electric quantity loss of the charging station, heat loss of each charging gun and equivalent operation error parameters of each charging gun;
step four, converting the equivalent operation error parameters of the charging gun into the operation error of the charging gun;
and step five, comparing the running error of the charging gun with a threshold value, and judging whether the charging gun is normally metered.
2. The method for monitoring the operation error of the metering equipment in the DC charging station according to claim 1, wherein the method comprises the following steps: the equation is:
Figure FDA0003084945060000011
in the formula, Ki is the equivalent operation error parameter phi of each charging gunDC,iFor each charging gun, ηiEnergy conversion efficiency of charging pile AC-DC conversion module corresponding to each charging guniIs the loss factor, epsilon0For inherent losses of charging station, phiACAnd supplying power to the AC side of the charging station, wherein i is the serial number of the charging guns, and M is the number of the charging guns.
3. The method for monitoring the operation error of the metering equipment in the DC charging station according to claim 2, wherein the method comprises the following steps: the system of equations is:
Figure FDA0003084945060000012
wherein P is a metering period, P is more than 10 times of the number M of the charging guns,
wherein, have again:
Figure FDA0003084945060000013
dy is the deviation of the charge station electric quantity measurement,
because the deviation dy of the electric quantity measurement of the charging station can be the electric quantity phi supplied by the AC side of the charging pileACPower consumption phi of each charging gunDC,iEnergy conversion efficiency eta of charging pile AC-DC conversion module corresponding to each charging guniThe unknown number is obtained as the only inherent loss epsilon of the charging station0Loss coefficient beta of each charging guniCharging gun equivalent operation error parameters Ki and charging pile AC side power supply electric quantity phiACPower consumption phi of each charging gunDC,iEnergy conversion efficiency eta of charging pile AC-DC conversion module corresponding to each charging guniAnd substituting the parameters into an equation set to solve and obtain equivalent operation error parameters Ki of each charging gun.
4. The method for monitoring the operation error of the metering equipment in the DC charging station according to claim 3, wherein the method comprises the following steps: running error epsilon of each charging guniIs obtained by the following formula:
Figure FDA0003084945060000021
5. the method for monitoring the operation error of the metering equipment in the DC charging station according to claim 2, wherein the method comprises the following steps: AC side power supply electric quantity phi of charging stationACObtained by reading an ac meter provided on the ac side.
6. The method for monitoring the operation error of the metering equipment in the DC charging station according to claim 2, wherein the method comprises the following steps: power consumption phi of each charging gunDC,iObtained by reading the charging gun meter.
7. According to the rightThe method for monitoring the operation error of the metering equipment in the direct current charging station according to claim 2, characterized in that: inherent loss epsilon of charging station0Charging, display and communication modules of the charging pile are included.
8. The method for monitoring the operation error of the metering equipment in the DC charging station according to claim 2, wherein the method comprises the following steps: energy conversion efficiency eta of AC-DC conversion module of each charging pileiObtained through factory certification data.
9. The method for monitoring the operation error of the metering equipment in the DC charging station according to claim 1, wherein the method comprises the following steps: and in the second step, the acquired data is remotely transmitted to a server, so that remote online monitoring is realized.
10. The method for monitoring the operation error of the metering equipment in the DC charging station according to claim 2, wherein the method comprises the following steps: the equation is obtained as follows:
according to the law of conservation of energy, there are:
charging station AC side power supply quantity is equal to DC side charging quantity + inherent loss + AC-DC conversion module loss quantity of each charging pile + heat loss power consumption of each charging gun (1)
Wherein the AC-DC conversion module efficiency eta satisfies:
Figure FDA0003084945060000022
the formula (1) and the formula (2) are combined to obtain
The AC side power supply quantity of the AC station is equal to the DC side charging quantity/etai+ energy consumption of each charging gun + inherent loss (3)
Simultaneously, the method comprises the following steps:
Figure FDA0003084945060000023
wherein phi isDC,iFor each charging gun, XDC,iThe real electricity consumption of each charging gun at the direct current side,
the following steps are provided:
Figure FDA0003084945060000024
derived from formula (4) and formula (5):
Figure FDA0003084945060000031
according to formula (3) and formula (6), we obtain:
Figure FDA0003084945060000032
wherein the content of the first and second substances,
Figure FDA0003084945060000033
for equivalent resistivity, making variable substitutions
Figure FDA0003084945060000034
Is provided with
Figure FDA0003084945060000035
Wherein beta isiThe loss coefficient is the parameter to be solved, because the voltage on the power transmission line in the corresponding station in the charging process of the charging gun is basically unchanged, the current in the whole charging process is stable, and the electric quantity loss is mainly the heat loss, the partial loss is in direct proportion to the square of the charging electric quantity,
the charging station electric quantity measurement deviation dy is:
Figure FDA0003084945060000036
substituting formula (5) and formula (8) for formula (9), there are:
Figure FDA0003084945060000037
combined vertical type (9) and formula (10) to obtain
Figure FDA0003084945060000038
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